Table of contents

• Timing
  • Files structure
    • openroad tcl scripts
    • settings
  • Running
    • exports
    • examples

Timing

---

NOTE: This document is a wip. It is not a finished documentation. The “timing” setup may not be complete and isn't free of bugs.

Files structure

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scripts/openroad
├── rcx.tcl
├── sta.tcl
└── timing_top.tcl
env
├── caravel_spef_mapping.tcl
├── common.tcl
├── ff.tcl
├── ss.tcl
└── tt.tcl
timing.mk

openroad tcl scripts

• rcx.tcl
  • runs openrcx (inside openroad app) performing spef extraction
  • uses openroad binary
• sta.tcl
  • runs opensta/openroad performing sta on a given block
  • uses either openroad or standalone opensta binary
• timing_top.tcl
  • runs opensta performing sta on the caravel (top) level
  • loads top level sdc which in the case of this repo is caravel.sdc
  • uses openroad binary

settings or env

• caravel_spef_mapping.tcl
  • sets mapping of spef files to the corresponding instance inside caravel
• common.tcl
  • sets settings that are common between all corners (technology specific)
• ff.tcl
  • sets FF liberty files
• tt.tcl
  • sets TT liberty files
• ss.tcl
  • sets SS liberty files

NOTE: The settings above are all in tcl syntax

Running

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exports

WARNING: These are the needed exports. Adjust them to your paths

export CUP_ROOT=${HOME}/gf180/caravel/caravel # CUP = caravel user project
export PDK_ROOT=${HOME}/gf180/pdk
export PDK=gf180mcuC
export OPENLANE_TAG=2022.02.23_02.50.41
export MCW_ROOT=${HOME}/gf180/caravel/mgmt_soc_litex # MCW = mgmt core wrapper
export CARAVEL_ROOT=${HOME}/gf180/caravel/caravel
export TIMING_ROOT=${HOME}/gf180/caravel

examples

make -f timing.mk caravel-timing-typ-nom
make -f timing.mk caravel-timing-fast-nom